<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
	<title>无标题</title>
</head>
<body>
<script type="text/javascript" src='jquery-1.7.2.min.js'></script>
<script type="text/javascript">
	$(function(){
		$('.box').hover(function() {
			time= setTimeout(function(){
				alert('1');
			},1000);
		}, function() {
			
		});
	})
</script>

<div class="box" style="width300px;height:300px; background:red;">
	
</div>
</body>
</html>